I ever heard that people choose to quit their job for doing some crypto job. Whether it is trading, mining, or bounty. But I think that's the worst idea. Maybe they think that kind job like that can earn many profit but they doesn't looking at the risk and keep do it. Look at the market, they stay red and it will hard to get profit from investing or trading. GPU price is more expensive as well as a lot of capital to be spent when starting mining. Also Bounty Hunter has bad condition right now with too many SCAM ICO which caused some of them just wasted their time and doesn't earn anything.
How they can earn money for daily need if only depends on the crypto?
Obviously correct! There's no greater thing than doing your regular job or maintaining it so you can have your financial backed up.
I do trading and bounty campaigns too but I only do it on my free time or afterwork. There's nothing wrong on trading or venture more profitable doings on bitcoin and altcoins. But we must prioritize the stable job we have because bitcoin and altcoins isn't profitable all the time.